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  <title>Make unified diff of two strings</title>
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<div id="layout">
  <div id="layout-content"><div id="function.xdiff-string-diff" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">xdiff_string_diff</h1>
  <p class="verinfo">(PECL xdiff &gt;= 0.2.0)</p><p class="refpurpose"><span class="refname">xdiff_string_diff</span> &mdash; <span class="dc-title">Make unified diff of two strings</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.xdiff-string-diff-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>xdiff_string_diff</strong></span>(<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">string</span> <code class="parameter">$old_data</code></span>,<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">string</span> <code class="parameter">$new_data</code></span>,<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">int</span> <code class="parameter">$context</code><span class="initializer"> = 3</span></span>,<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">bool</span> <code class="parameter">$minimal</code><span class="initializer"> = <strong><code>false</code></strong></span></span><br>): <span class="type">string</span></div>

  <p class="para rdfs-comment">
   Makes an unified diff containing differences between <code class="parameter">old_data</code> string and
   <code class="parameter">new_data</code> string and returns it. The resulting diff is human-readable. 
   An optional <code class="parameter">context</code> parameter specifies how many lines of context should be
   added around each change. Setting <code class="parameter">minimal</code> parameter 
   to true will result in outputting the shortest patch file possible (can take a long time). 
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.xdiff-string-diff-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">old_data</code></dt>

     <dd>

      <p class="para">
       First string with data. It acts as &quot;old&quot; data.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">new_data</code></dt>

     <dd>

      <p class="para">
       Second string with data. It acts as &quot;new&quot; data.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">context</code></dt>

     <dd>

      <p class="para">
       Indicates how many lines of context you want to include in the diff
       result.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">minimal</code></dt>

     <dd>

      <p class="para">
       Set this parameter to <strong><code>true</code></strong> if you want to minimalize the size of the
       result (can take a long time).
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.xdiff-string-diff-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns string with resulting diff or <strong><code>false</code></strong> if an internal error happened.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.xdiff-string-diff-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2252">
    <p><strong>示例 #1 <span class="function"><strong>xdiff_string_diff()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     The following code makes unified diff of two articles.
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$old_article&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">file_get_contents</span><span style="color: #007700">(</span><span style="color: #DD0000">'./old_article.txt'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$new_article&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$_REQUEST</span><span style="color: #007700">[</span><span style="color: #DD0000">'article'</span><span style="color: #007700">];&nbsp;</span><span style="color: #FF8000">/*&nbsp;Let's&nbsp;say&nbsp;that&nbsp;someone&nbsp;pasted&nbsp;a&nbsp;new&nbsp;article&nbsp;to&nbsp;html&nbsp;form&nbsp;*/<br /><br /></span><span style="color: #0000BB">$diff&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">xdiff_string_diff</span><span style="color: #007700">(</span><span style="color: #0000BB">$old_article</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$new_article</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />if&nbsp;(</span><span style="color: #0000BB">is_string</span><span style="color: #007700">(</span><span style="color: #0000BB">$diff</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Differences&nbsp;between&nbsp;two&nbsp;articles:\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$diff</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.xdiff-string-diff-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">注意</strong>: 
   <p class="para">
    This function doesn&#039;t work well with binary strings. To make diff of binary
    strings use <span class="function"><a href="function.xdiff-string-bdiff.html" class="function">xdiff_string_bdiff()</a></span>/<span class="function"><a href="function.xdiff-string-rabdiff.html" class="function">xdiff_string_rabdiff()</a></span>.
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.xdiff-string-diff-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.xdiff-string-patch.html" class="function" rel="rdfs-seeAlso">xdiff_string_patch()</a> - Patch a string with an unified diff</span></li>
   </ul>
  </p>
 </div>

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